NOVUS PRODUTOS ELETRÔNICOS LTDA.
2/7
ALARM OUTPUT (
a
a
a
aL
L
L
L
)
The controller has an alarm that can be configured to operate on any of
the output channels. It can be configured to operate in one of the
different functions as detailed in
Table 02
.
off
off
off
off
Output is not used as alarm.
lo
lo
lo
lo
Alarm of Absolute Minimum
Value. Triggers when the
value of measured
PV
is
below
the value defined for
alarm
Setpoint
(SPAL)
.
SPAL
PV
ki
ki
ki
ki
Alarm of Absolute Maximum
Value. Triggers when the
value of measured
PV
is
above
the value defined for
alarm
Setpoint
.
SPAL
PV
dif
dif
dif
dif
Alarm of Differential. In this function the parameters,
SPAL represent the deviation of PV in relation to the
SP of CONTROL.
SP
PV
SP + SPAL
SP – SPAL
SP
PV
SP – SPAL
SP + SPAL
alarme
Positive SPAL
Negative SPAL
difl
difl
difl
difl
Alarm of Minimum Differential Value. It triggers when
the value of PV is
below
the defined point by
SP-SPAL.
SP
PV
SP – SPAL
SP
PV
SP – SPAL
Positive SPAL
Negative SPAL
difk
difk
difk
difk
Alarm of Maximum Differential. Triggers when the
value of PV is
above
the defined point by SP+SPAL.
SP
PV
SP + SPAL
SP
PV
SP + SPAL
Positive SPAL
Negative SPAL
ierr
ierr
ierr
ierr
Alarms of the Sensor Break (Sensor
Break Alarm
). It
is activated when the Input presents problems such
as interrupted sensor, bad connection, etc.
Table 02
– Alarm functions
INITIAL BLOCKING OF ALARM
The option to
block initial
alarms inhibits the alarms in the case that
there is an alarm condition present on startup. The alarm will be
enabled only after the occurrence of a non alarm condition.
Initial blocking is useful, for example, in the initialization of process
control operations when the value of the PV is still far from the SP
value. Hence the system waits for alarm situations and unwanted
alarms are avoided.
The initial blocking is disabled for the sensor break alarm function
ierr
ierr
ierr
ierr
.
RUN FUNCTION
The
RUN
function, executed by the
RUN
parameter, works as a
general key of the controller, enabling or not its operation.
When enabled to work (RUN = YES), the controller is free to perform
all its functions. When disabled (RUN = NO), its outputs are switched
off and only functions related to temperature measurement and
indication continue to operate.
The RUN indicator on the controller front panel, when accessed,
indicates that the control is enabled (RUN = YES).
The RUN function can be executed by the F key, which toggles the
control condition between enabled and disabled.
The touch on
is long, i.e. > 2 seconds, to disregard quick
accidental touches.
OFFSET
This parameter allows fine adjustments to the PV reading for
compensation of sensor error. Offset allows measurements errors to
be corrected when they occur, for example, after the substitution of a
temperature sensor.
TIMERS
The controller has two timers,
T1
e
T2
, which together provide
different modes of action. The timing period starts with T1 and, at the
end of it, it starts
T2
.
Only
T1
has its time count displayed on the controller display.
With the ZERO value set for any of the timers, the actuation and
sequence remains unchanged.
The timers can be associated with any controller output:
OUT1
or
OUT2
. The output associated with
T1
, switches on during the T1
timing period and the output associated with
T2
switches on during
the
T2
timing period.
The
A1
and
A2
indicators light up during
T1
and
T2
timing periods,
respectively.
At the end of T2, the A2 indicator flashes (*).
If T2 = 0, at the end of T1, the A1 indicator flashes (*).
(*) the controller can be set to disable the control (RUN = OFF) at the
end of the timing period and, in this case, the indicators are also
cleared.
TIMER START MODES
There are two options to start the timing period:
SP
starts counting when the measured temperature value
(PV) reaches the SP value set for the process.
F
starts the timing period by pressing the
F
key (short
press < 1 s).
After starting the timing period, a new short touch on F
ONLY stops the timing period (stops it and brings it back
to zero).
When RUN= F, a LONG touch on F starts and controls
the timing period.
A LONG touch on F ( > 2 s), disables the control.
The Timer Start mode is set in the
t.str
t.str
t.str
t.str
parameter in the controller
Timing Cycle.
TEMPERATURE CONTROL BEHAVIOR AT THE END OF THE
TIMING PERIOD (T1+T2)
During the timing period of the T1 and T2 intervals, the temperature
control has normal and independent operation. However, at the end
of the T1 + T2 interval, it is possible to set the controller to disable
the temperature control. The
t.e.(.o
t.e.(.o
t.e.(.o
t.e.(.o
parameter, in the controller
Timing Cycle, allows the definition of the desired condition:
on
on
on
on
the temperature control continues to work as usual.
off
off
off
off
the temperature control is disabled, turning the control
output off.
UP/DOWN TIMER COUNTING
Both timers can be configured to display the counting in incrementing
(UP) or decrementing (DOWN) modes. In UP mode, the counting
starts at zero and counts up until the time setting is reached. In
DOWN mode, the display starts showing the time setting and counts
down to zero.
TIME BASE OF THE TIMERS
The parameter
TBAS
TBAS
TBAS
TBAS
at the end of the timing cycle defines the time
base that will be used. The options are:
Sec
Sec
Sec
Sec
MM:SS. The intervals of T1 and T2 are presented in
minutes and seconds.
Min
Min
Min
Min
HH:MM. The intervals of T1 and T2 are presented in hours
and minutes.
